unity panel disappears with libreoffice impress

[Xiang Liu]

hello everyone,

The unity panel will disappear if the following steps are taken.

1. open libreoffice impress and create a blank impress document.
2. choose menu: view--> master --> slide master
3. then close the master view immediately.
4. now, the unity panel disappears
5. press ctrl-alt-delete twice will bring the panel back.

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 12.04.4 LTS
Release:	12.04
Codename:	precise

libreoffice was fetched and installed from official website: libreoffice.org
Version: 4.1.6.2
Build ID: 40ff705089295be5be0aae9b15123f687c05b0a